Isekai wa Smartphone to Tomo ni - Novel

Oh no, Kami-­sama accidentally killed the Hero by mistake and he starts a second life in a parallel world. Kami­-sama revives his body and he is allowed to take and use his smartphone. He comes across various people while making important comrades and before the Hero is aware of it, he has discovered this world’s secret. He inherits the legacy of an ancient civilization and he goes around the world nonchalantly while having power that matches that of the kings in this world.